/*
 * $Id: EventListenerMap.java 3189 2009-01-20 17:46:04Z kschaefe $
 *
 * Copyright 2006 Sun Microsystems, Inc., 4150 Network Circle,
 * Santa Clara, California 95054, U.S.A. All rights reserved.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */
package org.jdesktop.swingx.event;

import java.util.ArrayList;
import java.util.EventListener;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

/**
 * Intended to be a replacement for {@link javax.swing.event.EventListenerList}.
 * 
 * @author Joshua Outwater
 * @author Karl Schaefer
 * @see javax.swing.event.EventListenerList
 */
public class EventListenerMap {
	private final Map<Class<? extends EventListener>, List<? extends EventListener>> listenerList = new HashMap<Class<? extends EventListener>, List<? extends EventListener>>();

	/**
	 * Returns a list containing all of the listeners managed by this
	 * {@code EventListenerMap}.
	 * 
	 * @return all managed listeners
	 */
	public List<EventListener> getListeners() {
		List<EventListener> listeners = new ArrayList<EventListener>();

		for (List<? extends EventListener> list : listenerList.values()) {
			listeners.addAll(list);
		}

		return listeners;
	}

	/**
	 * Return a list of all the listeners of the given type.
	 * 
	 * @return all of the listeners of the specified type.
	 */
	@SuppressWarnings("unchecked")
	public <T extends EventListener> List<T> getListeners(Class<T> clazz) {
		List<T> list = (List<T>) listenerList.get(clazz);
		if (list == null) {
			list = new ArrayList<T>();
		}
		return list;
	}

	/**
	 * Returns the total number of listeners of the supplied type for this
	 * listener list.
	 */
	public int getListenerCount() {
		int count = 0;

		for (List<? extends EventListener> list : listenerList.values()) {
			count += list.size();
		}

		return count;
	}

	/**
	 * Returns the total number of listeners for this listener type.
	 */
	@SuppressWarnings("unchecked")
	public <T extends EventListener> int getListenerCount(Class<T> clazz) {
		List<T> list = (List<T>) listenerList.get(clazz);
		if (list != null) {
			return list.size();
		}
		return 0;
	}

	/**
	 * Adds the listener as a listener of the specified type.
	 * 
	 * @param <T>
	 *            the type of the listener to be added
	 * @param clazz
	 *            the class type to add
	 * @param l
	 *            the listener to be added
	 */
	@SuppressWarnings("unchecked")
	public synchronized <T extends EventListener> void add(Class<T> clazz, T listener) {
		if (listener == null) {
			return;
		}

		List<T> list = (List<T>) listenerList.get(clazz);
		if (list == null) {
			list = new ArrayList<T>();
			listenerList.put(clazz, list);
		}
		list.add(listener);
	}

	/**
	 * Removes the listener as a listener of the specified type.
	 * 
	 * @param <T>
	 *            the type of the listener to remove
	 * @param clazz
	 *            the class type to remove
	 * @param l
	 *            the listener to remove
	 */
	@SuppressWarnings("unchecked")
	public synchronized <T extends EventListener> void remove(Class<T> clazz, T listener) {
		if (listener == null) {
			return;
		}

		List<T> list = (List<T>) listenerList.get(clazz);
		if (list != null) {
			list.remove(listener);
		}
	}
}